Wonderful film. There is kind of a roundabout connection in that Edward Lionheart (played by Vincent Price) seems like the kind of actor who would have been right at home at Collinwood.
Ian Hendry, who played John Steed's original partner on THE AVENGERS, is also on board. A couple of years ago, another of Ian's missing episodes, "Tunnel of Fear," was found and issued on DVD in the UK. Although Ian and Diana have scenes together in THEATRE OF BLOOD, they never worked together on THE AVENGERS.
G.